The average depth is 1,744 metres (5,722 ft) and maximum depth is 2,789 metres (9,150 ft).

Spanish coast along the Bay of Biscay

The Bay of Biscay is home to some of the Atlantic Ocean's baddest weather. Large storms happen in the bay, especially during the winter months. Up until recent years ships would wreck in Biscay storms, and many lives were lost. Improved ships and weather prediction have helped.

Many species of whales and dolphins can be seen in this area. It is one of the few places where the beaked whales such as the Cuvier's beaked whale have been seen frequently. This is the best study area for beaked whales in the world. The best areas to see the larger cetaceans are in the deep waters beyond the continental shelf.